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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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Thumbnail Image From YouTube:
This recording was taken about 90 miles from the Japanese earthquake’s epicenter. There are two distinct sound waves. Both are caused by the mainshock. A “pop” is heard 90 seconds (in actual time) after the main event. This pop wasn’t recorded at any other nearby stations, leading Georgia Tech Associate Professor Zhigang Peng to believe that either the ground shifted immediately under the measuring station, or the hill slope where the station sits in helps to amplify the shaking. It was the strongest reading he found – a ground acceleration of nearly three g.
